From 48970de6529300702f81d34b053bc7ba8bee6d9b Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Wed, 14 Aug 2024 10:45:03 +0200
Subject: [PATCH] Billing: Fix error when no deliveries exist in season

---
 Elwig/Helpers/Billing/Billing.cs | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/Elwig/Helpers/Billing/Billing.cs b/Elwig/Helpers/Billing/Billing.cs
index 1d32746..92564e0 100644
--- a/Elwig/Helpers/Billing/Billing.cs
+++ b/Elwig/Helpers/Billing/Billing.cs
@@ -157,13 +157,15 @@ namespace Elwig.Helpers.Billing {
                 lastMgNr = mgnr;
             }
 
-            await AppDbContext.ExecuteBatch(cnx, $"""
-                UPDATE delivery_part_bucket SET value = 0 WHERE year = {Year};
-                INSERT INTO delivery_part_bucket (year, did, dpnr, bktnr, discr, value)
-                VALUES {string.Join(",\n       ", inserts.Select(i => $"({Year}, {i.Item1}, {i.Item2}, {i.Item3}, '{i.Item4}', {i.Item5})"))}
-                ON CONFLICT DO UPDATE
-                SET discr = excluded.discr, value = value + excluded.value;
-                """);
+            await AppDbContext.ExecuteBatch(cnx, $"UPDATE delivery_part_bucket SET value = 0 WHERE year = {Year}");
+            if (inserts.Count > 0) {
+                await AppDbContext.ExecuteBatch(cnx, $"""
+                    INSERT INTO delivery_part_bucket (year, did, dpnr, bktnr, discr, value)
+                    VALUES {string.Join(",\n       ", inserts.Select(i => $"({Year}, {i.Item1}, {i.Item2}, {i.Item3}, '{i.Item4}', {i.Item5})"))}
+                    ON CONFLICT DO UPDATE
+                    SET discr = excluded.discr, value = value + excluded.value;
+                    """);
+            }
 
             if (!avoidUnderDlvrs) {
                 if (ownCnx) await cnx.DisposeAsync();